阅读说明：本技术 一种电动阀及其制造方法 (Electrically operated valve and manufacturing method thereof ) 是由 吕铭 支建成 杨达迈 于 2018-05-17 设计创作，主要内容包括：一种电动阀及其制造方法,该电动阀包括阀体部件(40)、阀座部件(20)、传动部件(30),阀芯部件(10)设置于阀腔(416),阀芯部件(10)包括上筒体(12)、阀芯本体(11)、连接件(14),上筒体(12)包括第一腔体(2),上筒体(12)的上端部包括上止挡部,阀芯本体(11)大致呈圆管状,阀芯本体(11)包括环状薄壁部(112),阀芯本体(11)包括第二腔体(3)；螺母(32)包括径向凸出部(321),径向凸出部(321)能够与上止挡部配合,连接件(14)包括第一轴向通孔(4,4’),连接件(14)的上端部包括下止挡部(143),环状薄壁部(112)能够与所述阀座部件(20)的密封部(222)抵接,所述螺母(32)的下端部能够与所述下止挡部(143)配合,以限制所述螺母(32)向下移动。该电动阀,能够降低阀芯部件(10)受到的压差力,提高阀的动作性。(An electric valve and a manufacturing method thereof, the electric valve comprises a valve body component (40), a valve seat component (20) and a transmission component (30), the valve core component (10) is arranged in a valve cavity (416), the valve core component (10) comprises an upper cylinder (12), a valve core body (11) and a connecting piece (14), the upper cylinder (12) comprises a first cavity (2), the upper end part of the upper cylinder (12) comprises an upper stop part, the valve core body (11) is approximately in a circular tube shape, the valve core body (11) comprises an annular thin-wall part (112), and the valve core body (11) comprises a second cavity (3); the nut (32) includes radial bulge (321), and radial bulge (321) can cooperate with last backstop portion, and connecting piece (14) include first axial through-hole (4, 4'), and the upper end of connecting piece (14) includes lower backstop portion (143), and annular thin wall portion (112) can with sealing portion (222) butt of valve seat part (20), the lower tip of nut (32) can with backstop portion (143) cooperation down, in order to restrict nut (32) moves down. The motor-operated valve can reduce the differential pressure force received by the valve body component (10) and improve the operability of the valve.)

An electrically operated valve comprising:

a valve body component comprising a valve body including a first fluid port;

a valve seat member fixedly connected with the valve body member, the valve seat member comprising a valve seat body comprising a second fluid port;

the transmission component is arranged in a valve cavity of the electric valve and comprises a screw rod and a nut, and the screw rod is in threaded connection with the nut;

the valve core component is arranged in the valve cavity and comprises an upper cylinder, a valve core body and a connecting piece fixedly connected with the upper cylinder and the valve core body;

the upper cylinder comprises a first cavity, the upper end of the upper cylinder comprises an upper stop part, the valve core body is approximately in a circular tube shape, and the valve core body comprises an annular thin-wall part; the valve core body comprises a second cavity; the upper end part of the connecting piece faces the first cavity, the lower end part of the connecting piece faces the second cavity, the nut comprises a radial protruding part arranged in the first cavity, and the radial protruding part can be matched with the upper stop part so that the nut can drive the valve core component to move axially; the connecting piece include with first cavity with the first axial through-hole of second cavity intercommunication, the upper end of connecting piece includes backstop portion down, cyclic annular thin wall portion can with the sealing portion butt of valve seat part, the lower tip of nut can with backstop portion cooperation down, in order to restrict the nut moves down.

The electrically operated valve of claim 1, further comprising a spool guide member, wherein the spool guide member comprises a guide sleeve, the guide sleeve is substantially in the shape of a circular tube, and the guide sleeve is fixedly connected with the valve body member; the outer wall of the upper cylinder body is in clearance fit with the inner wall of the guide sleeve, the outer diameter of the upper cylinder body is larger than the outer diameter of the valve core body, the guide sleeve comprises a guide section in clearance fit with the upper cylinder body, the guide sleeve further comprises an installation section, and the inner diameter of the installation section is smaller than that of the guide section; the sealing assembly is arranged between the inner wall of the installation section and the outer wall of the valve core body, and comprises a sealing part sleeved on the peripheral part of the valve core body, and the sealing part is elastically abutted between the inner wall of the installation section and the outer wall of the valve core body.

The electric valve according to claim 2, wherein the sealing assembly further comprises an upper limiting member disposed above the sealing member and a lower limiting member disposed below the sealing member, the upper limiting member and the lower limiting member are sleeved on the outer periphery of the valve plug body, the guide section and the mounting section form a first positioning step portion with a downward step surface, the inner wall of the mounting section further comprises a second positioning step portion with a downward step surface, the upper end portion of the upper limiting member abuts against the first positioning step portion, the upper end portion of the lower limiting member abuts against the second positioning step portion, and the lower end portion of the lower limiting member is riveted or welded with the lower end portion of the guide sleeve.

The electric valve according to claim 1, wherein the upper cylinder is an integral structure, the upper cylinder is integrally formed by drawing a metal material or integrally formed by punching a metal material, the upper cylinder includes a body portion and a lateral bending portion extending from an upper end of the body portion in a radial direction, a lower end portion of the lateral bending portion serves as the upper stopper portion, the lateral bending portion includes a second axial through hole, the nut is disposed through the second axial through hole, and a lower end portion of the body portion is welded or riveted to the connecting member.

The electric valve according to claim 4, wherein the cross-section of the connecting member is annular, and the connecting member comprises an upper section, a middle section and a lower section with successively decreasing outer diameters; on the outer wall of the connecting piece, a third positioning step part with a downward step surface is formed by the upper section and the middle section, and a fourth step part with a downward step surface is formed by the middle section and the lower section; the lower end part of the upper cylinder body is matched with the third positioning step part and is riveted or welded and fixed, the upper end part of the valve core body is sleeved on the periphery of the lower section, and the upper end part of the valve core body is abutted against the fourth step part and is welded and fixed with the lower section.

The electrically operated valve according to claim 4, wherein the cross section of the connecting member is annular, the connecting member includes an upper section and a lower section, the outer diameter of the upper section and the outer diameter of the lower section are sequentially reduced, a fifth positioning step portion with a downward step surface is formed on the outer wall of the connecting member, the lower end portion of the upper cylinder is riveted with the fifth positioning step portion or welded and fixed with the fifth positioning step portion, the valve core body is sleeved on the outer periphery of the lower section, and the upper end portion of the valve core body is abutted against and welded and fixed with the fifth positioning step portion.

The electric valve according to any of the claims 1 to 6, wherein the nut further comprises a lower extension provided to the first cavity, the lower extension having a circular tube shape, the lower extension comprising a receiving cavity provided with a compression spring, one end of the compression spring abutting the nut and the other end abutting the lower stop.

The electrically operated valve according to any one of claims 1 to 6, wherein the valve seat member comprises a valve seat body fixedly connected to the valve body member, the valve seat body comprises a third axial through hole, an upper end surface portion of the valve seat body comprises a recessed portion with an inner bottom surface facing upward, a valve seat core is fixed to the recessed portion, the valve seat core is made of a plastic material, the upper end surface portion of the valve seat core forms the sealing portion, and the annular thin-walled portion comprises a fitting portion having an arc structure, and a bottom end of the arc structure can abut against or be separated from the sealing portion.

The electric valve according to claim 8, wherein the valve core body comprises a small diameter section and the annular thin-walled portion disposed below the small diameter section, the outer circumference of the small diameter section is sleeved with the sealing assembly, the outer diameter and the inner diameter of the annular thin-walled portion are respectively larger than the outer diameter and the inner diameter of the small diameter section, and a projection of the outer wall of the small diameter section in the horizontal direction substantially coincides with a circular line where the bottom end of the circular arc structure is located.

The electrically operated valve according to claim 9, wherein a difference between an outer diameter of the annular thin-walled portion and an outer diameter of the small diameter section is less than or equal to 0.5 mm.

The electrically operated valve according to any one of claims 1 to 6, wherein the valve seat body is fixedly connected to the valve body member, the valve seat body includes a third axial through hole, an upper end surface portion of the valve seat body includes a recessed portion with an inner bottom surface facing upward, the recessed portion is fixed with a valve seat core, the valve seat core is made of a plastic material, the upper end surface portion of the valve seat core forms the sealing portion, the annular thin wall portion includes a fitting portion having a circular truncated cone structure with a large upper portion and a small lower portion, a lower end surface of the circular truncated cone structure forms an annular sealing plane, and the annular sealing plane can abut against or be separated from the sealing portion.

The electric valve according to claim 11, wherein the valve core body comprises a small diameter section and the annular thin-walled portion disposed below the small diameter section, the sealing assembly is sleeved on an outer peripheral portion of the small diameter section, an outer diameter and an inner diameter of the annular thin-walled portion are respectively larger than the outer diameter and the inner diameter of the small diameter section, and a projection of an outer wall of the small diameter section in a horizontal direction is substantially coincident with a central circular line of the annular sealing plane.

The electrically operated valve according to claim 12, wherein a difference between an outer diameter of the annular thin-walled portion and an outer diameter of the small diameter section is less than or equal to 0.5 mm.

The electric valve according to any one of claims 1 to 6, wherein the valve seat body is fixedly connected to the valve body member, the valve seat body includes a third axial through hole, an upper end surface portion of the valve seat body includes an upper step portion having an upward step surface, a valve seat core is fixed to the upper step portion, the valve seat core is made of a plastic material, the valve seat core includes an annular base portion and an annular protrusion extending upward from the upper end portion of the base portion, an outer diameter of the protrusion is smaller than an outer diameter of the base portion, the upper end surface portion of the protrusion forms the sealing portion, a valve port sheath is disposed in the third axial through hole, an outer wall of the valve port sheath abuts against an inner wall of the valve seat core and is welded and fixed to the inner wall of the valve seat body, and the valve port sheath is axially higher than the sealing portion.

The electric valve according to any one of claims 1 to 6, wherein the hole wall of the first axial through hole comprises a sixth positioning step, the sixth positioning step is provided with a filter component, the filter component comprises a support ring and a filter element, an elastic element is sleeved on the outer periphery of the filter element, one end of the support ring abuts against the elastic element, and the other end of the support ring abuts against the sixth positioning step.

A method of manufacturing an electrically operated valve as claimed in claim 1, comprising the steps of:

s1, providing an upper barrel: the hollow upper cylinder body is processed by a metal material drawing and integral forming method or a metal material stamping and integral forming method, and the upper end of the upper cylinder body comprises a first axial through hole and an upper stop part;

s2, assembling the nut, the upper cylinder and the connecting piece: limiting the radial protruding part on the first cavity by the upper stop part, and riveting or welding the lower end part of the upper cylinder and the connecting piece;

s3, providing a valve core body and a sealing assembly, wherein the valve core body comprises a small-diameter section and an annular thin-walled part arranged below the small-diameter section, the small-diameter section is approximately in a circular tube shape, and the inner diameter and the outer diameter of the annular thin-walled part are larger than those of the small-diameter section; sleeving the sealing assembly on the periphery of the small-diameter section, and welding and fixing the upper end part of the small-diameter section and the connecting piece;

s4, providing a guide sleeve, and welding and fixing the guide sleeve and the valve body to form a second assembly component;

s5, connecting the nut with the screw rod through threads, and riveting or welding the lower end part of the guide sleeve with the sealing assembly;

s6, providing a valve seat core with a sealing part and a valve seat body made of metal material, wherein the upper end surface of the valve seat body is provided with an upper positioning step part with an upward step surface for installing the valve seat core, and the valve seat core is installed on the upper positioning step part and is riveted and fixed with the upper end of the valve seat body;

and S7, welding and fixing the valve body and the valve seat body.

The method of manufacturing an electrically operated valve according to claim 16, wherein the step S2 further comprises the steps of: through plastic materials injection molding processing the nut makes the nut including set up in the lower extension of radial bulge below, lower extension processing has the chamber of holding, install elastic element in hold the chamber, and make elastic element's one end with the nut butt, the other end with the lower backstop portion butt of connecting piece.

The electrically operated valve according to claim 16, wherein in step S1, a third positioning step portion with a downward step surface is formed on an inner wall of a lower end portion of the upper cylinder; in step S2, the connecting piece includes an annular upper section, an annular middle section, and an annular lower section, the outer diameter of the upper section is greater than the outer diameter of the middle section, the outer diameter of the middle section is greater than the outer diameter of the lower section, the upper end surface of the upper section abuts against the third positioning step, and the lower end of the upper cylinder is riveted or welded to the lower end surface of the upper section; in the step S3, the valve element body is sleeved on the outer wall of the lower section, and the upper end of the valve element body abuts against the lower end surface of the middle section and is welded and fixed to the outer wall of the lower section.